冷拉拔Cu-2.5% Fe-0.2% Cr和Cu-6% Fe合金的显微组织与性能（英文）

发布时间：2018-04-20 05:03

本文选题：铜合金 + 变形　；参考：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2015年08期

【摘要】：目的:探索Cu-Fe合金中纳米尺寸和微米尺寸的Fe相的变形行为及区别。方法:1.通过热处理在Cu-2.5%Fe-0.2%Cr合金中得到纳米级的Fe析出相,在Cu-6%Fe中得到微米级的Fe析出相;2.通过冷拉拔手段使铜合金从棒状逐步变形成线材;3.使用光学显微镜、扫描电镜和透射电镜观察微观组织,并用万能电子试验机测量抗拉强度,用标准四点法测量电阻率。结论:1.通过热处理在Cu-6%Fe合金中得到尺寸约50 nm的初生Fe颗粒,在Cu-2.5%Fe-0.2%Cr合金中得到尺寸约50 nm的次生Fe颗粒;2.初生Fe颗粒在冷拉拔过程中转变成丝带状纤维,Cu/Fe相界面密度随变形量增加而增加,从而使Cu-6%Fe合金的强度和电阻率都随之增大;3.次生Fe颗粒即使在η=6的时候也难以变形,保持着球形的形貌,同时高密度的位错环绕着Fe颗粒;Cu-2.5%Fe-0.2%Cr合金的强度随变形量增加而增大,遵循Orowan强化机制;Cu-2.5%Fe-0.2%Cr合金的电阻率几乎保持不变,因为Cu/Fe相界面密度在冷拉拔过程中几乎不变;4.尺寸效应和Fe析出颗粒与Cu基体的非共格界面对Fe析出颗粒在冷拉拔过程中不变形起到重要作用。
[Abstract]:Objective: to study the deformation behavior and difference of Fe phase with nanometer and micron size in Cu-Fe alloy. Method 1: 1. Nanocrystalline Fe precipitates were obtained by heat treatment in Cu-2.5-0.2%Cr alloys and micrometer Fe precipitates were obtained in Cu-6. The copper alloy is gradually deformed from rod to wire by cold drawing. The microstructure was observed by optical microscope, scanning electron microscope and transmission electron microscope, tensile strength was measured by universal electronic testing machine, and resistivity was measured by standard four-point method. Conclusion 1. Primary Fe particles of about 50 nm in size were obtained by heat treatment in Cu-6 alloys and secondary Fe particles of about 50 nm in Cu-2.5-0.2%Cr alloys were obtained. During cold drawing, the interfacial density of primary Fe particles is increased with the increase of deformation, which increases the strength and resistivity of Cu-6 alloy. The secondary Fe particles are difficult to deform even at 畏 6 and maintain the spherical morphology, while the high density dislocations surround the Fe particles, and the strength of Cu-2.5-0.2%Cr alloys increases with the increase of deformation. The resistivity of Cu-2.5-0.2%Cr alloy is almost unchanged because the interfacial density of Cu/Fe phase is almost unchanged during cold drawing. The size effect and the non-coherent interface between Fe precipitated particles and Cu matrix play an important role in the non-deformation of Fe precipitated particles during cold drawing.
【作者单位】： Department
【基金】：Project supported by the National Natural Science Foundation of China(No.11202183) the National High-Tech R&D Program(863 Program)of China(No.2011AA11A101) the Public Projects of Zhejiang Province(No.2012C31023) the Zhejiang Provincial Natural Science Foundation of China(No.LQ12B01001)
【分类号】：TG359;TG146.11

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